The Minnesota Multiphasic Personality Inventory (MMPI) is the most frequently used personality test in the mental health fields. This assessment, or test, was designed to help identify personal, social, and behavioral problems in psychiatric patients. The test helps provide relevant information to aid in problem identification, diagnosis, and treatment planning for the patient.

The test has also been used for job screening and other non-clinical assessments, which is considered controversial and is in some cases illegal.

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The original MMPI was developed at the University of Minnesota Hospitals and first published in 1942. The original authors of the MMPI were Starke R. Hathaway, PhD, and J. C. McKinley, MD. The MMPI is copyrighted and is a trademark of the University of Minnesota[1]: Clinicians must pay a fee each time it is administered.

The current standardized version for adults 18 and over, the MMPI-2, was released in 1989, with a subsequent revision of certain test elements in early 2001. The MMPI-2 has 567 items, or questions, and takes approximately 60 to 90 minutes to complete. There is a short form of the test that is comprised of the first 370 items on the long-form MMPI-2. There is also a version of the inventory for adolescents age 14 to 18, the MMPI-A.
Norms are published based on a sample of 2600 people of diverse ages from a variety of backgrounds.

Identification of suitable candidates for high-risk public safety positions such as nuclear power plant workers, police officers, airline pilots, medical and psychology students, firefighters and seminary students

By the 1960s, the MMPI was being given by companies to employees and applicants as often as to psychiatric patients. Sociologist William H. Whyte was among many who saw the tests as helping to create and perpetuate the oppressive groupthink of mid-century corporate capitalism.

In 1965 the Senate Subcommittee on Constitutional Rights of the Committee on the Judiciary, chaired by Senator Sam Ervin, and the House Special Subcommittee on Invasion of Privacy of the Committee on Government Operations, chaired by Representative Cornelius E. Gallagher, held hearings to determine whether the questions asked on psychological tests used by the Federal Government were an unjustified invasion of the respondent’s psyche and private life. The Subcommittees also investigated the validity of these tests and the due process issues involved in test administration. The reactions of the press and public were very critical of the types of questions asked on these psychological tests.

In 1966, Senator Ervin introduced a bill to sharply curtail the government's use of the MMPI and similar tests, comparing them to McCarthyism. Ervin's bill failed.